Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-12-05
Phys. Rev. A 84, 063634 (2011)
Physics
Condensed Matter
Quantum Gases
7 pages, 5 figures
Scientific paper
10.1103/PhysRevA.84.063634
We revisit in detail the non-mean-field ground-state phase diagram for a binary mixture of spin-1 Bose-Einstein condensates including quantum fluctuations. The non-commuting terms in the spin-dependent Hamiltonian under single spatial mode approximation make it difficult to obtain exact eigenstates. Utilizing the spin z-component conservation and the total spin angular momentum conservation, we numerically derive the information of the building blocks and evaluate von Neumann entropy to quantify the ground states. The mean-field phase boundaries are found to remain largely intact, yet the ground states show fragmented and entangled behaviors within large parameter spaces of interspecies spin-exchange and singlet-pairing interactions.
Lu Rong
Xu Z. F.
You Liangzhi
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